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<p>Glass sealants are frequently used to ensure the tight sealing of individual solid oxide fuel cells (SOFC) in a stack. In the case of tubular SOFC, sealing is complicated because 3D details are required to fill the gap between the single tubular SOFC and the interconnect. Therefore, material extrusion of sealant–polymer composite filaments was used. Utilizing a mixture of atactic and isotactic polypropylene as a polymer matrix, powder-filled composites with the self-made SAN-2 aluminosilicate glass sealant concentration of 72 wt% (47 vol%) are successfully extruded. Applying the 14iPP–14aPP–72SAN-2 (wt.%) composite, parts suitable for tubular SOFC sealing have been prepared through fused deposition modeling (FDM). The printed parts are characterized by fine adhesion to the printing table and interlayer adhesion. Small bubbles formed in the sealant volume after polymer burnout have no pronounced effect on the stability of the SOFC|sealant|inteconnect joint which is proven by open circuit voltage test in dual atmosphere.</p>

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3D printing in SOFC sealing: highly filled polypropylene-glass feedstocks

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Ivan Tolstobrov,
  • Evgenia Shirokova,
  • Alyona Vepreva,
  • Dmitry Dubovtsev,
  • Daniil Boldyrev,
  • Anton Kuzmin,
  • Nailya Saetova

摘要

Glass sealants are frequently used to ensure the tight sealing of individual solid oxide fuel cells (SOFC) in a stack. In the case of tubular SOFC, sealing is complicated because 3D details are required to fill the gap between the single tubular SOFC and the interconnect. Therefore, material extrusion of sealant–polymer composite filaments was used. Utilizing a mixture of atactic and isotactic polypropylene as a polymer matrix, powder-filled composites with the self-made SAN-2 aluminosilicate glass sealant concentration of 72 wt% (47 vol%) are successfully extruded. Applying the 14iPP–14aPP–72SAN-2 (wt.%) composite, parts suitable for tubular SOFC sealing have been prepared through fused deposition modeling (FDM). The printed parts are characterized by fine adhesion to the printing table and interlayer adhesion. Small bubbles formed in the sealant volume after polymer burnout have no pronounced effect on the stability of the SOFC|sealant|inteconnect joint which is proven by open circuit voltage test in dual atmosphere.